Currently, due to the development of nanotechnology and metamaterials, it has become important to obtain regular self-organized structures, with different parameters. Porous anodic alumina films are self-organizing structures, which can be represented in a hexagonal packing of cylindrical pores normal to the plane of the aluminum film and used as a template for synthesis of various nanocomposites. The diameter of pores and the distance between them can vary (pore diameter — from 2 to 350 nm, the distance between the pores — from 5 to 50 nm), using different electrolytes, voltage and anodizing time. Currently, there are various models that describe the growth of a porous film of aluminum oxide, but none take into account the influence of aluminum layers and electrolyte on the rate of aluminum oxide growth, as well as the effect of surface diffusion. In present work we consider those effects.

The flow of a highly viscous liquid in a half-space due to the deformation of the free surface is investigated. The viscosity of the layer adjoining to the free surface is different from the viscosity of the remaining half-space. In the framework of small perturbation theory, the relationship between the deformation of the free surface and the deformation of the layer/half-space interface is obtained. It was demonstrated that the volume and geometrical center of the perturbation on the interface and on the free surface are the same. The dependence of the perturbation’s amplitude and width on layer thickness was investigated. The results of numerical and analytical calculations are close, even for moderate free surface perturbations.

Some regularities of covalent functionalization of multiwalled carbon nanotubes (MWCNTs) with oxygencontaining moieties were investigated. The materials obtained were studied by electron microscopy, thermogravimetry, FTIR and Raman spectroscopy. The dependence of the degree of MWCNTs functionalization on the process conditions was studied. The advantages of the gas phase to liquid phase oxidation of MWCNTs were shown. The effects of pristine and functionalized MWCNTs on the properties of composites with polysulfone were investigated. Both pristine and functionalized MWCNTs were modified with polyaniline. The effects of the method and the degree of prefunctionalization of the MWCNTs on the oxidative polymerization of aniline and the properties of the materials obtained were elucidated.

Lowtemperature thermopower in disordered carbon nanotubes was calculated while taking into account multiple elastic electron scattering on impurities and shortrange structural inhomogeneities. A possible explanation is presented for the lowtemperature behavior of thermopower which depends on defect structure, impurities and chirality.

Theoretical investigation results of the periodic domain structures induced by an electric field in barium strontium titanate (BaxSr1−x)TiO3 ferroelectric thin film are presented. A novel type of tunable phononic crystal based on an electric field-induced piezoelectric effect in a thin ferroelectric film is proposed. Surface acoustic wave propagation equations for the substrate under electric field-induced periodic domains are derived. Finite element simulation revealed the possibility of applying the ferroelectric phononic crystal as an electrically tunable surface acoustic wave filter.

In this report, we study the reduced conditional dynamics of a quantum system in the case of indirect quantum measurement. The detector’s microscopic part (pointer) interacts with the measured system (target) and the environment, which results in a nonunitary interaction between target and pointer. The quantum state evolution conditioned by the measurement result is under investigation. Particularly, we are interested in explicit analytical expressions for the conditional evolution superoperators and basic information characteristics of this measurement process, which is applied to the cavity mode photodetection problem.

A study of the properties of polycrystalline uorite-type NaY1􀀀x􀀀yYbxEryF4 solid solutions demonstrated that NaY0:87Yb0:10Er0:03F4 and NaY0:885Yb0:1Er0:015F4 samples produced up-conversion luminescence with 3.35% and 3.62% quantum yields, which were higher than quantum yields of the other NaY_1-x-yyYb_xEr_yF₄ samples. NaY_1-x-yYb_xEr_yF₄ specimens were prepared by co-precipitation from aqueous solutions by drop- wise addition of rare earth nitrate solutions to aqueous sodium uoride.

In molecular dynamics, Hamiltonian systems of differential equations are numerically integrated using some symplectic method. Symplectic integrators are simple algorithms that appear to be wellsuited for large scale simulations. One feature of these simulations is that there is an unphysical drift in the energy of the system over long integration periods. A drift in the energy is more obvious when a relatively long time step is used. In this article, a special approach, based on symplectic discretization and momenta corrections, is presented. The proposed method conserves the total energy of the system over the interval of simulation for any acceptable time step. A new approach to perform a constanttemperature molecular dynamics simulation is also presented. Numerical experiments illustrating these approaches are described.

The coefficients of viscosity for polycarbonate/poly(methyl methacrylate) (PC/PMMA) blends in tetrahydrofuran at 303.15 K and 313.15 K have been measured. The measured parameters were used to estimate other related physical quantities, like Huggins constants and the interaction parameters and  , proposed by Chee and Sun et al. to identify the molecular interaction arising in solutions of the mentioned polymer blends. The peculiar deviation confirmed the structural changes in the solutions of the blends. FTIR and SEM studies confirm the formation of physical blends.

In this work, the results of the investigation of the precularity near the solar spectrum region, of Zn_1−xCd_xS nanoparticles, nanofilms, nanoscale p-n and heterojunction prepared on glass-ceramic and alumminium substrates by precipitation from aqueous solutions are presented. We investigated the preparation of ZnCdS nanoparticles in a micro-emulsion system stabilized with nonionic surface active materials, as well as the impact of drop volume and supersaturation the size of the formed ZnCdS particles. The temperature dependence of dark and light conductivity, spectrum and optical quenching of primary and impurity photoconductivity were investigated. Direct current-voltage characteristic structure of Al/p-CdS/n-CdS is almost identical to the current-voltage characteristics of p-n junctions. Volt-farad characteristics of the samples established the presence of conduction due to the presence of reverse bias p-n junctions. In the following order, CdTe/CdS/Zn_1−xCd_xS structure have 75% or slightly higher quantum efficiency in the 400–850 nm wavelength region.

Oligomerization of hex-1-ene over acid catalysts obtained by the impregnation of cerium dioxide by sulfatecontaining compounds (sulfuric acid or its salts) was studied. Maximum conversion of hexene-1 over sulfated ceria catalysts was 7–12% at 60°C.

The mechanism of BiFeO₃ nanoparticle formation from initial compositions obtained by bismuth and iron hydroxides coprecipitation has been studied. The activation temperature of the BiFeO₃ nucleation and nanocrystal growth is shown to correlate with that of the nonautonomous phase’s melting. The optimal temperature range during nanoparticle formation by the method in question was found to be between 460–520(40) ^оC.

Isotherms for the sorption of light fullerenes (C₆₀ and C₇₀) from toluene solutions with the use of multiwall carbon nanotubes (MWCNTs) were investigated. Both isotherms are of the Langmuir-type. The successful liquid chromatographic separation of light fullerenes from toluene solutions was accomplished using the above-mentioned sorbent.